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Issue 26, 2018
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Pseudocapacitive layered birnessite sodium manganese dioxide for high-rate non-aqueous sodium ion capacitors

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Abstract

Layered transition metal oxides are promising cathodes for sodium ion capacitors due to their high specific capacity. In this work, we present a layered birnessite sodium manganese dioxide (Na0.77MnO2·0.5H2O) supported by a two-dimensional conductive network (denoted as b-NMO/C) as a cathode for non-aqueous sodium ion capacitor (SIC). The interlayer crystal water and carbon networks promote the ion/electron transport kinetics and overcome the structural instability, leading to largely enhanced electrochemical performance. As a result, the as-synthesized b-NMO/C cathode delivers a capacity of 192 mA h g−1 at 0.25C and 43 mA h g−1 even at a high rate of 100C. The attained performance is compared favorably with those of state-of-the-art Mn-based cathodes for sodium ion storage. Furthermore, the assembled asymmetric SIC (b-NMO/C//graphite) exhibits the highest energy (91 W h kg−1 achieved at ∼84 W kg−1) and power (5816 W kg−1 achieved at ∼37 W h kg−1) densities within the voltage range of 0.5–3.8 V.

Graphical abstract: Pseudocapacitive layered birnessite sodium manganese dioxide for high-rate non-aqueous sodium ion capacitors

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Supplementary files

Article information


Submitted
18 Mar 2018
Accepted
29 May 2018
First published
31 May 2018

J. Mater. Chem. A, 2018,6, 12259-12266
Article type
Communication

Pseudocapacitive layered birnessite sodium manganese dioxide for high-rate non-aqueous sodium ion capacitors

Y. Jiang, S. Tan, Q. Wei, J. Dong, Q. Li, F. Xiong, J. Sheng, Q. An and L. Mai, J. Mater. Chem. A, 2018, 6, 12259
DOI: 10.1039/C8TA02516A

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